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          一步一步之JDK&SpringBooot3新特性
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        <h2 id="JDK新特性"><a href="#JDK新特性" class="headerlink" title="JDK新特性"></a>JDK新特性</h2><h3 id="JDK9"><a href="#JDK9" class="headerlink" title="JDK9"></a>JDK9</h3><p>module 可以定义包是否暴露给外部，模块-包-接口、类</p>
<p>步骤</p>
<ol>
<li><p>新建module模块，新建 module-info.java 文件，包括调用模块和被调用模块</p>
</li>
<li><p>被调用模块 module-info.java</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">module</span> testa &#123;</span><br><span class="line">    <span class="keyword">exports</span> com.testa.test1;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>调用模块 module-info.java</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">module</span> testb &#123;</span><br><span class="line">    <span class="keyword">requires</span> testa;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

</li>
</ol>
<h3 id="JDK10"><a href="#JDK10" class="headerlink" title="JDK10"></a>JDK10</h3><p>var 局部变量推导</p>
<ul>
<li>必须能推导实际类型</li>
<li>只用于定义变量</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> test1 = <span class="keyword">new</span> Test1();</span><br><span class="line"><span class="comment">// 必须有初始化</span></span><br><span class="line"><span class="keyword">var</span> test11; <span class="comment">// 报错</span></span><br><span class="line">vat test111 = <span class="keyword">null</span>; <span class="comment">// 报错</span></span><br></pre></td></tr></table></figure>

<p><strong>看不出有什么好处</strong></p>
<h3 id="JDK11"><a href="#JDK11" class="headerlink" title="JDK11"></a>JDK11</h3><ul>
<li><p>java 命令可以直接运行java文件，像其他语言 java hello.java，对于初学者友好些。</p>
</li>
<li><p><code>#!</code> 符号叫做shebang，音译成 “释棒”，解释伴随行，类似shell脚本的<code>#!/bin/bash</code>（以此开头的文件，执行时会调用 /bin/bash 程序执行），可以命令行执行 ./TestC，执行java文件</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">#!/Library/Java/JavaVirtualMachines/jdk-17.jdk/Contents/Home/bin/java --source 17</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TestC</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"Hello World"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<h3 id="JDK14"><a href="#JDK14" class="headerlink" title="JDK14"></a>JDK14</h3><ul>
<li><p>文本块，多行字符串，三个字符串</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">String test = <span class="string">""</span><span class="string">"</span></span><br><span class="line"><span class="string">    Hello</span></span><br><span class="line"><span class="string">                World</span></span><br><span class="line"><span class="string">                "</span><span class="string">""</span>;</span><br><span class="line">    System.out.println(test);</span><br></pre></td></tr></table></figure>
</li>
<li><p>instanceof 增强</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Object a = <span class="string">"test"</span>;</span><br><span class="line"><span class="keyword">if</span>(a <span class="keyword">instanceof</span> String b) &#123;</span><br><span class="line">    System.out.println(b);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

</li>
</ul>
<h3 id="JDK16"><a href="#JDK16" class="headerlink" title="JDK16"></a>JDK16</h3><ul>
<li><p>Record类型</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 只能初始化1次，属性相当于final</span></span><br><span class="line">TestRecord testRecord = <span class="keyword">new</span> TestRecord(<span class="string">"issac"</span>, <span class="string">"young"</span>);</span><br><span class="line">String name = testRecord.name();</span><br></pre></td></tr></table></figure>

</li>
</ul>
<h3 id="JDK17"><a href="#JDK17" class="headerlink" title="JDK17"></a>JDK17</h3><ul>
<li>Sealed类，类的继承很难管理，使用 Sealed显示管理；父类是 Sealed 类，至少有个继承</li>
<li>Switch 增强，配合instanceOf 增强</li>
</ul>
<h2 id="SpringBoot3"><a href="#SpringBoot3" class="headerlink" title="SpringBoot3"></a>SpringBoot3</h2><h3 id="AOT"><a href="#AOT" class="headerlink" title="AOT"></a>AOT</h3><p>预编译，无法跨平台</p>
<ul>
<li>优点，启动和运行速度快，几十倍的提升，运行直接跟机器操作系统（无jvm）；打包体积小，直接exe；可以用于云服务器，快速启动，朝着云原生方向</li>
<li>缺点，编译后不支持跨平台，比如exe程序不能在linux上运行，springboot直接编译成jar，windows和linux都支持部署；还不支持aop，提前编译好；谨慎使用</li>
</ul>
<h3 id="JIT"><a href="#JIT" class="headerlink" title="JIT"></a>JIT</h3><p>实时编译，程序运行时编译，运行机器码，跨平台基础</p>
<ul>
<li>热点应用，重启之后，出现业务超时，几分钟之后恢复正常</li>
<li>不是每个类都会jit编译，根据类调用的频繁程度</li>
</ul>
<h4 id="解决方法"><a href="#解决方法" class="headerlink" title="解决方法"></a>解决方法</h4><ul>
<li>预热：初始让程序自动运行热点代码几百次</li>
<li>流量控制：启动时小流量，运行几分钟后再放到正常流量</li>
</ul>
<h3 id="GraalVM"><a href="#GraalVM" class="headerlink" title="GraalVM"></a>GraalVM</h3><p>代替jvm</p>
<ul>
<li><p>下载 <a href="https://www.graalvm.org/" target="_blank" rel="noopener">https://www.graalvm.org/</a> </p>
</li>
<li><p>配置环境变量 <code>$JAVA_HOME</code> 为graalvm的Home目录</p>
</li>
<li><p>在线安装 native-image</p>
</li>
</ul>
<h3 id="新建springboot"><a href="#新建springboot" class="headerlink" title="新建springboot"></a>新建springboot</h3><p>版本号3.0.0</p>

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